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Question
The important physical properties of substances are colour, odour, nature, density & solubility in water.
Name – a gas with a pungent, choking odour which is lighter than air
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Solution
A gas with a pungent, choking odour which is lighter than air is Ammonia
RELATED QUESTIONS
Write true or false
All pure substances have characteristic melting and boiling points.
Give one example for the following types of mixtures :
solid-liquid heterogenous mixture.
Differentiate between:
Homogenous and heterogenous substances
Indicate whether the following statement is true or false:
Elements are made up of compounds
Complete the statement given below by filling in the blank with the correct word.
The basic unit of an element is an __________.
Select the correct answer to the statement given below:
A compound containing carbon, oxygen and calcium.
Select the correct answer from the choice given below to complete the sentence :
Dust in air is an example of _________ mixture.
Higher Order Thinking Skills.
In the diagram given below, the circle, square and triangle represent the atoms of different elements.
Identify all combinations that represent
- molecule of a compound
- molecule of an element consisting of two atoms
- molecule of an element consisting of three atoms
Match the following.
| Atom | Building block of matter |
| Element | Atoms of different kinds |
| Compound | Atoms of the same kind |
| Molecule | Smallest unit of a substance |
Matter is its simplest form is called ______.
